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Diagram of the MDS architecture emphasizing the central role of explicitly represented state knowledge and models, goal directed operation, and the separation of state determination from control in all feedback loops. Abstract. Not only has the number of launched spacecraft per year exploded recently, but spacecraft are also getting progressively more(More)
While NASA is increasingly interested in multi-platform space missions, controlling such platforms via timed command sequences-the current favored operations technique-is unfortunately very difficult, and a key source of this complexity involves resolving conflicts to coordinate multiple spacecraft plans. We propose distributed constraint satisfaction(More)
We present an algorithm for summarizing the metric resource requirements of an abstract task based on the resource usages of its potential refinements. We use this summary information within the ASPEN planner/scheduler to coordinate a team of rovers that conflict over shared resources. We find analytically and experimentally that an iterative repair planner(More)
While past flight projects involved a single spacecraft in isolation, over forty proposed future missions involve multiple coordinated spacecraft. This paper presents characteristics of such missions in terms ofproperties of the phenomena being measured as well as the rationale for using multiple spacecraft. We describe the coordination problems associated(More)
The trend toward multiple-spacecraft missions requires autonomous teams of spacecraft to coordinate their activities when sharing limited resources. This paper describes how an iterative repair planner/scheduler can reason about the activities of multiple spacecraft at abstract levels in order to greatly improve the scheduling of their use of shared(More)
Interacting agents that interleave planning and execution must reach consensus on their commitments to each other. For domains with varying degrees of interaction and different constraints on communication and computation, agents will require different coordination protocols in order to efficiently achieve their goals. ShAC (Shared Activity Coordination) is(More)
BACKGROUND Experiencing the death of a patient can be one of the most challenging aspects of clinical medicine for medical students. Exploring what students' learn from this difficult experience may contribute to our understanding of how medical students become doctors, and provide insights into the role a medical school may play in this development. This(More)
There is an increasing need for space missions to be able to collaboratively (and competitively) develop plans both within and across missions. In addition, interacting spacecraft that interleave onboard planning and execution must reach consensus on their commitments to each other prior to execution. In domains where missions have varying degrees of(More)
The ever-increasing size and complexity of aerospace systems often drive developers to validate using modeling and Monte Carlo simulations confined around expected points of operation in a hyper-dimensional parameter space. This paper describes an alternative that explores large regions of the parameter space with explicit coverage guarantees, searching for(More)